In a large bowl, combine softened cream cheese and powdered sugar with peppermint essence until smooth and well mixed.
Melt semisweet chocolate chips and chopped Andes mints in the microwave at 50% power in 30-second intervals, stirring until smooth.
Pour the melted chocolate mixture into the cream cheese mixture and beat until fully combined and smooth.
Transfer the mixture onto plastic wrap, shape into a log, wrap tightly, and refrigerate for 45 minutes to firm up.
Roll the chilled mixture into 1-inch balls and place them on a parchment-lined baking tray, spaced apart.
Melt the milk chocolate melting wafers in the microwave at 50% power in 30-second bursts, keeping it warm over a steaming pot.
Dip each truffle ball into the melted chocolate using a fork, coating it completely, then shake off excess and return to the baking tray.
Optionally, sprinkle chopped Andes mints on top of each truffle immediately after dipping to garnish.